Translate the application using Flask-babel.

The only translation so far is french, but more can be added. The browser language
is used thanks to the HTTP languages headers.

There are still some problems with the translation of some strings, I don't know
why this is. See #12

1 files changed, 23 insertions, 18 deletions

diff --git a/budget/web.py b/budget/web.py
index 8b251a1..263c1db 100644
--- a/budget/web.py
+++ b/budget/web.py
@@ -2,6 +2,7 @@ from collections import defaultdict
 
 from flask import *
 from flaskext.mail import Mail, Message
+from flaskext.babel import Babel, get_locale, gettext as _
 import werkzeug
 
 # local modules
@@ -22,6 +23,8 @@ and `add_project_id` for a quick overview
 
 main = Blueprint("main", __name__)
 mail = Mail()
+babel = Babel()
+
 
 @main.url_defaults
 def add_project_id(endpoint, values):
@@ -85,7 +88,7 @@ def authenticate(project_id=None):
         if request.method == "POST":
             if form.validate():
                 if not form.password.data == project.password:
-                    form.errors['password'] = ["This private code is not the right one"]
+                    form.errors['password'] = [_("This private code is not the right one")]
                 else:
                     # maintain a list of visited projects
                     if "projects" not in session:
@@ -133,9 +136,10 @@ def create_project():
             # send reminder email
             g.project = project
             
-            message_title = "You have just created '%s' to share your expenses" % g.project.name
+            message_title = _("You have just created '%(project)s' to share your expenses",
+                    project=g.project.name)
 
-            message_body = render_template("reminder_mail")
+            message_body = render_template("reminder_mail.%s" % get_locale().language)
 
             msg = Message(message_title, 
                 body=message_body, 
@@ -143,7 +147,7 @@ def create_project():
             mail.send(msg)
 
             # redirect the user to the next step (invite)
-            flash("The project identifier is %s" % project.id)
+            flash(_("The project identifier is %(project)s", project=project.id))
             return redirect(url_for(".invite", project_id=project.id))
 
     return render_template("create_project.html", form=form)
@@ -158,9 +162,10 @@ def remind_password():
 
             # send the password reminder
             mail.send(Message("password recovery", 
-                body=render_template("password_reminder", project=project), 
+                body=render_template("password_reminder.%s" % get_locale().language,
+                    project=project), 
                 recipients=[project.contact_email]))
-            flash("a mail has been sent to you with the password")
+            flash(_("a mail has been sent to you with the password"))
 
     return render_template("password_reminder.html", form=form)
 
@@ -216,16 +221,16 @@ def invite():
         if form.validate():
             # send the email
 
-            message_body = render_template("invitation_mail")
+            message_body = render_template("invitation_mail.%s" % get_locale().language)
 
-            message_title = "You have been invited to share your"\
-                    + " expenses for %s" % g.project.name
+            message_title = _("You have been invited to share your expenses for %(project)s", 
+                    project=g.project.name)
             msg = Message(message_title, 
                 body=message_body, 
                 recipients=[email.strip() 
                     for email in form.emails.data.split(",")])
             mail.send(msg)
-            flash("You invitations have been sent")
+            flash(_("Your invitations have been sent"))
             return redirect(url_for(".list_bills"))
 
     return render_template("send_invites.html", form=form)
@@ -246,7 +251,7 @@ def add_member():
         if form.validate():
             member = form.save(g.project, Person())
             db.session.commit()
-            flash("%s is had been added" % member.name)
+            flash(_("%(member)s had been added", member=member.name))
             return redirect(url_for(".list_bills"))
 
     return render_template("add_member.html", form=form)
@@ -258,7 +263,7 @@ def reactivate(member_id):
     if person:
         person[0].activated = True
         db.session.commit()
-        flash("%s is part of this project again" % person[0].name)
+        flash(_("%(name)s is part of this project again", name=person[0].name))
     return redirect(url_for(".list_bills"))
 
 
@@ -266,9 +271,9 @@ def reactivate(member_id):
 def remove_member(member_id):
     member = g.project.remove_member(member_id)
     if member.activated == False:
-        flash("User '%s' has been desactivated" % member.name)
+        flash(_("User '%(name)s' has been deactivated", name=member.name))
     else:
-        flash("User '%s' has been removed" % member.name)
+        flash(_("User '%(name)s' has been removed", name=member.name))
 
     return redirect(url_for(".list_bills"))
 
@@ -281,7 +286,7 @@ def add_bill():
             db.session.add(form.save(bill, g.project))
             db.session.commit()
 
-            flash("The bill has been added")
+            flash(_("The bill has been added"))
             return redirect(url_for('.list_bills'))
 
     return render_template("add_bill.html", form=form)
@@ -296,7 +301,7 @@ def delete_bill(bill_id):
 
     db.session.delete(bill)
     db.session.commit()
-    flash("The bill has been deleted")
+    flash(_("The bill has been deleted"))
 
     return redirect(url_for('.list_bills'))
 
@@ -314,7 +319,7 @@ def edit_bill(bill_id):
         form.save(bill, g.project)
         db.session.commit()
 
-        flash("The bill has been modified")
+        flash(_("The bill has been modified"))
         return redirect(url_for('.list_bills'))
 
     form.fill(bill)
@@ -331,6 +336,6 @@ def create_archive():
     if request.method == "POST":
         if form.validate():
             pass
-            flash("The data from XX to XX has been archived")
+            flash(_("The data from XX to XX has been archived"))
 
     return render_template("create_archive.html", form=form)